Improvement in cloth-cutting machines



'1. FENNU.

Glnth Cutting Machines- No. 134,793. Parentedjammwsf UNITED STATEsPATENT OFFICE.

ISAAC FENNO, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN CLOTH-CUTTINGY MACHINES.

Specification forming part of Letters Patent No. 134,793, dated January14, 1873.

To all whom it may concern! Y Be it known that I, ISAAC FENNO, ofBoston, in theV county of Suolk and State of Massachusetts, haveinvented certain new and useful Improvements in Machines for CuttingCloth, &c.; and I do herebydeclare that the following is a full, clear,and exact description thereof, that will enable others skilled in theart to which it 4appertains to make and use the same, reference beinghad to the accompanying drawing and to the letters of reference markedthereon which form a part of this specification.

My invention relates to certain improvements on cloth-cutting machines,consisting in the arrangement of a supporting-spring made to support theouter jointed arm that is made to move up and down, for thepurpose ofallowing the cutting-knife to be kept at the same distance from theupper side of the operating-table, even if the said table should not beperfectly level in all its parts. The weight of the arm keeps the footor throat plate always in contact with the operating-table.

0n the drawing, Figure 1is a side elevation, and Fig. 2 is an enlargedend view of the knife and shield.

a is the operating-table, to which the ma chine is secured, and overwhich the knife is guided. rlhe objection to this kind of a machine hasbeen that when the table was not perfectly level the throat-plate wouldbe lifted o from the table in one position of the machine, and crowdedagainst it in another position thereof, owing to the connection beingtoo rigid. This objection I now overcome by connecting the arm b looselyto the hinge l part c by means of the pin d in such a man- 11er that thearm b may move up and down, but not sidewise, around the pin d, by whichar- `and claim israngement the foot or throat plate c will always bekept in contact with the table a, even if the said table should notprove exactly level. But as the weight of the arm b and its outerconnections would create too much friction between the foot-plate andthe table if it was not supported or balanced partially from below, Isecure to the `hinge part c a suitable spring, f, as shown, provided inits outer end with a re gulatin g-screw, g, screwed through the springf, and resting against the arm b, or in a similar way, by which thepressure'of the throat-plate on the table can easily be adjusted andregulated. It is also necessary to adjust the sleeve h up or'down,according to the size of the knife that is used, for which purpose Imake it movable in a bearing, t', attached to the end ofthe arm b, asshown. When adjusted it may be held in place by means'of check-nuts klo, as shown, or, by means of a set-screw, l, or their equivalents.

The shield m that covers the knife n and protects the operators handsduring the operation is provided with a hinge, o, whereby a part of theshield may be moved away, as shown in dotted lines on Fig. 2, when it isdesired to sharpen the knife, or for other reasons.

l l/Vhat I wish to secure by Letters Patent The hinged arm b, hinge partc, and the supporting-spring f, combined and operating as and for thepurpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand this25th day of October, 1872.

ISAAC FENNO. Witnesses:

FRED. O.` STANTON, GEORGE E. PHELPs.

